You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'Criterion of Validity in Reasoning' by Charles Sanders Peirce and 'Intro to 2nd ed of Principia Mathematica' by Bertrand Russell
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |